Mr. Roarke mentions that one of the guests has a fantasy of having lunch with Charlie's Angels. The executive producer of Charlie's Angels (1976) is Aaron Spelling, who was also an executive producer of this and many other shows that aired during the 1970's to the 1990's.
This is the first of several appearances made by Georgia Engel, albeit as different characters. Many other actors and actresses would make multiple appearances as well.
Devil's Island was a French penal colony that operated for more than 100 years, from 1852 to 1953, in the Salvation Islands of French Guiana. It was notorious both for the staff's harsh treatment of detainees and the tropical climate and diseases that contributed to high mortality.
The Devil's Island prison system had a death rate of 75% at the worst, and was finally closed down in 1953.